Acidogenic potential of oral bifidobacterium and its high fluoride tolerance

Ayumi Manome, Yuki Abiko, Junko Kawashima, Jumpei Washio, Satoshi Fukumoto, Nobuhiro Takahashi

研究成果: Contribution to journalArticle

4 引用 (Scopus)

抜粋

Bifidobacterium is frequently detected in early childhood caries and white spot lesions, indicating that it is a novel caries-associated bacterium. Bifidobacterium is known to possess a unique metabolic pathway, the “bifid shunt,” which might give it cariogenic potential by increasing its acid production. Thus, we evaluated the acid-producing activity of Bifidobacterium and its sensitivity to fluoride, a caries preventive reagent. Bifidobacterium longum, Bifidobacterium dentium, and Streptococcus mutans were used. Acid-producing activity was measured using a pH-stat in the absence and presence of fluoride under anaerobic conditions. Furthermore, metabolomic analysis was performed to elucidate the mechanism underlying the inhibitory effects of fluoride. The acid production of Bifidobacterium at pH 5.5 was as high as that seen at pH 7.0, indicating that Bifidobacterium has high cariogenic potential, although it produced less acid than S. mutans. In addition, Bifidobacterium produced acid in the absence of extracellular carbohydrates, suggesting that it can store intracellular polysaccharides. Bifidobacterium produced more acid from lactose than from glucose. Bifidobacterium mainly produced acetate, whereas S. mutans mainly produced lactate. The 50% inhibitory concentration (IC50) of fluoride for acid production was 6.0-14.2 times higher in Bifidobacterium than in S. mutans. Fluoride inhibited enolase in the glycolysis, resulting in the intracellular accumulation of 3-phosphoenolpyruvate, glucose 6-phosphate, and erythrose 4-phosphate. However, the bifid shunt provides a bypass pathway that can be used to produce acetate, suggesting that Bifidobacterium is able to metabolize carbohydrates in the presence of fluoride. It is suggested that its exclusive acetate production contributes to the pathogenesis of dental caries.

元の言語英語
記事番号1099
ジャーナルFrontiers in Microbiology
10
発行部数MAY
DOI
出版物ステータス出版済み - 1 1 2019
外部発表Yes

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Microbiology (medical)

フィンガープリント Acidogenic potential of oral bifidobacterium and its high fluoride tolerance' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

  • これを引用